Delete row sig_2b51756b9993 from signals

id sig_2b51756b9993
event_id evt_7dbe1d2e8ee0
watcher_id NULL
signal_type news_headline_delta
value {"aggregator_url":"https://news.google ...
threshold NULL
direction NULL
severity NULL
window NULL
source news_rss
reason_trace {"_evidence_event_ids":["evt_bc82455f0 ...
dedupe_key signal_enriched:news_delta:e2c8b3a4680b9e73
throttle_s 0
created_at 2026-04-19T10:31:33.091229+00:00
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